Water Quality in Rancho Cucamonga, CA (92363)
EPA violation data for public water systems serving ZIP code 92363.
Active Health Violations
51 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 99% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
5,531
Population
34
Water Systems
324
Violations (5yr)
51
Health-Based
Location
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Water Systems Serving This Area (34)
Chino Basin Mwd
San Gabriel Valley Wc - Fontana
San Bernardino City
Cucamonga Valley Water District
Ontario Municipal Utilities Company
Victorville Water District
San Bernardino Valley Wd
East Valley Water District
West Valley Water District
Hesperia Wd
Needles, City Of
All resolvedChemehuevi Water
Arizona Village
4 health-basedAvi Casino
9 health-basedCalifornia Village
Rainbo Beach
All resolvedMesquite Creek
Palms River Resort
Havasu Water Company
27 health-basedHavasu Wc
9 health-basedNeedles Koa
All resolvedHavasu Water Compnay
Northshore Rv Resort Inc
All resolvedChemhuevi Indian Tribe
Oasis At Havasu Palms
1 health-basedDesert View Rv Resort
Avi Kwa Ame Farms North
Chemehuevi Homesite #2
Fenders
1 health-basedLaughlin Information Center
San Bernardino County Trans
Essex Elem School
Chemeheuvi Homesite #1
Contaminants Found
Missed testing deadlines — not a detection of bacteria.
Annual water quality report delivery requirement.
Used to disinfect water — generally safe at regulated levels.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
At high levels, nitrate can cause blue baby syndrome in infants.
Similar to nitrate — harmful to infants at high levels.
Monitoring for chemicals formed during water treatment disinfection.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jan 2025
How Does This Compare?
Rancho Cucamonga (92363) has more violations than 99% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 324.
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.